linux查找文件夹下的文件是否含有某个字段

#!/usr/bin/python
# -*- coding:utf8 -*-

import os
sub_str = "interface TenGigabitEthernet"
#def get_file_content(file):
    #filecon = open()

def get_dir(path):
    files = os.listdir(path)
    for file in files:
        if file[0] == '.':
            pass
        if os.path.isdir(file):
            get_dir(path+'/'+file)
        else:
            file_name = path + '/' + file
            with open(file_name) as file_obj:
                for content in file_obj:
                    if content.find(sub_str) != -1:
                        print(file_name)

if __name__ == '__main__':
    # file_content = open("file_content.txt", "wb")
    path = "/root/v2.75"
    get_dir(path)